Sumida Corporation Manufacturer Skill

Overview

Sumida Corporation is a leading manufacturer of magnetic components, specializing in:

• Power Inductors - SMD and through-hole designs for DC-DC converters
• Drum Core Inductors - High current applications
• Shielded Inductors - EMI-sensitive designs
• Chip Inductors - Compact surface mount applications
• Common Mode Chokes - EMI/EMC filtering
• Edge-Wound Inductors - High frequency applications

MPN Structure

Sumida MPNs follow this general structure:

[SERIES][SIZE][SUFFIX]-[VALUE][TOLERANCE][TERMINATION]
   |      |      |        |       |          |
   |      |      |        |       |          +-- Termination code (NC, MC, etc.)
   |      |      |        |       +-- Tolerance: M=+/-20%, N=+/-30%, J=+/-5%
   |      |      |        +-- Inductance value (R-notation: 4R7 = 4.7uH)
   |      |      +-- Optional suffix (NP=Non-magnetic, etc.)
   |      +-- Size code (series-dependent encoding)
   +-- Series prefix (CDRH, CDR, CDEP, CR, CLF, etc.)

Example Decoding

CDRH6D28NP-4R7NC
|   |  | |  |  |
|   |  | |  |  +-- NC = Non-magnetic terminals
|   |  | |  +-- 4R7 = 4.7uH inductance (R = decimal)
|   |  | +-- NP = Non-magnetic core/shield
|   |  +-- 28 = 2.8mm height
|   +-- 6D = 6mm x 6mm footprint
+-- CDRH = SMD Power Inductor series

CDR125NP-100MC
|  |  | |  |
|  |  | |  +-- MC = Magnetic terminals
|  |  | +-- 100 = 10uH (EIA code: 10 x 10^0)
|  |  +-- NP = Non-magnetic
|  +-- 125 = 12.5mm diameter drum
+-- CDR = Drum Core Inductor series

---

Product Series

SMD Power Inductors

Series	Type	Description	Typical Use
CDRH	SMD Power	Standard SMD power inductor	DC-DC converters
CDEP	Shielded SMD	Shielded power inductor	EMI-sensitive designs
CDEF	High Efficiency	Low DCR, high efficiency	High-efficiency PSUs
CLF	Low Profile	Thin power inductor	Height-constrained designs

Drum Core Inductors

Series	Type	Description	Typical Use
CDR	Drum Core	High current drum inductor	High current applications
RCH	High Current	Very high saturation current	Power supplies
CEP	Edge-Wound	Edge-wound construction	High frequency

Chip Inductors

Series	Type	Description	Typical Use
CR	Chip Inductor	Multilayer chip inductor	General SMD circuits

EMI Components

Series	Type	Description	Typical Use
CDC	Common Mode Choke	EMI suppression	Power line filtering

---

Inductance Value Code

Sumida uses two notation systems for inductance values:

R-Notation (Primary)

The "R" character represents the decimal point:

Code	Calculation	Value
R47	0.47	0.47 uH
1R5	1.5	1.5 uH
4R7	4.7	4.7 uH
10R	10.0	10 uH
22R	22.0	22 uH
47R	47.0	47 uH

EIA 3-Digit Code

Standard EIA multiplier format (first two digits x 10^third digit):

Code	Calculation	Value
100	10 x 10^0	10 uH
220	22 x 10^0	22 uH
470	47 x 10^0	47 uH
101	10 x 10^1	100 uH
221	22 x 10^1	220 uH
102	10 x 10^2	1000 uH = 1 mH

---

Tolerance Codes

Code	Tolerance
J	+/- 5%
K	+/- 10%
M	+/- 20%
N	+/- 30%

---

Termination Codes

Code	Description
NC	Non-magnetic terminals (tin-plated)
MC	Magnetic terminals
C	Standard terminals

---

Size Code Reference by Series

CDRH Series Size Codes

CDRH uses format

[L]D[H]

where L=length/width, D=delimiter, H=height:

Code	Dimensions (L x W x H)	Notes
4D28	4.0mm x 4.0mm x 2.8mm	Compact
6D28	6.0mm x 6.0mm x 2.8mm	Standard
8D43	8.0mm x 8.0mm x 4.3mm	Higher current
10D43	10.0mm x 10.0mm x 4.3mm	High current
12D58	12.0mm x 12.0mm x 5.8mm	Very high current

Height decoding:

28

= 2.8mm,

43

= 4.3mm,

58

= 5.8mm

CDR Series Size Codes

CDR uses diameter encoding:

Code	Diameter	Notes
74	7.4mm	Standard
104	10.4mm	Higher current
125	12.5mm	High current
127	12.7mm	Alternative 12.5mm

CDEP Series Size Codes

CDEP uses format

[WW][H]

where WW=width, H=height:

Code	Dimensions (L x W x H)	Notes
104	10.0mm x 10.0mm x 4.0mm	Standard
105	10.0mm x 10.0mm x 5.0mm	Taller version
126	12.0mm x 12.0mm x 6.0mm	Large footprint

CR Series Size Codes

CR chip inductors use millimeter encoding:

Code	Size	EIA Equivalent
16	1.6mm x 0.8mm	0603
21	2.1mm x 1.2mm	0805
32	3.2mm x 1.6mm	1206

CLF Series Size Codes

CLF uses format

[LL][WW][H]

(5 digits):

Code	Dimensions (L x W x H)	Notes
10040	10.0mm x 10.0mm x 4.0mm	Standard low profile
12060	12.0mm x 12.0mm x 6.0mm	Large low profile

---

Package Code Extraction

The handler extracts and decodes size codes to human-readable dimensions:

MPN	Extracted Package
CDRH6D28NP-4R7NC	6x6x2.8mm
CDRH4D28NP-1R5NC	4x4x2.8mm
CDRH8D43NP-100MC	8x8x4.3mm
CDR74NP-100MC	7.4mm
CDR125NP-220MC	12.5mm
CDEP104NP-1R5MC	10x10x4mm
CDEP105NP-4R7MC	10x10x5mm
CR21-100JM	2.1mm
CLF10040-470MC	10x10x4.0mm

---

Series Extraction

The handler extracts the series prefix (without size code):

MPN	Extracted Series
CDRH6D28NP-4R7NC	CDRH
CDRH4D28NP-1R5NC	CDRH
CDR125NP-100MC	CDR
CDEP104NP-1R5MC	CDEP
CDEF38NP-100MC	CDEF
CR21-100JM	CR
RCH110NP-1R0MC	RCH
CEP105NP-4R7MC	CEP
CDC2G2NP-100MC	CDC
CLF10040-470MC	CLF

Series Extraction Order (Important)

Due to prefix overlap, series must be checked in this order:

1. CDRH

   (before CDR)

2. CDEP

   (before CDE)

3. CDEF

   (before CDE)

4. CDC

5. CDR

   (generic CD prefix)

6. CLF

7. CR

8. RCH

9. CEP

---

Supported Component Types

The SumidaHandler supports:

• ComponentType.INDUCTOR

  - Base inductor type

Note: Sumida does not have a manufacturer-specific inductor type (e.g.,

INDUCTOR_SUMIDA

) in this codebase.

---

Example MPNs with Full Decoding

CDRH6D28NP-4R7NC

Series:      CDRH (SMD Power Inductor)
Size:        6D28 (6.0mm x 6.0mm x 2.8mm)
Suffix:      NP = Non-magnetic core
Inductance:  4R7 = 4.7 uH
Tolerance:   N = +/- 30%
Termination: C = Standard

Full Series: CDRH
Package:     6x6x2.8mm

CDR125NP-100MC

Series:      CDR (Drum Core Inductor)
Size:        125 (12.5mm diameter)
Suffix:      NP = Non-magnetic core
Inductance:  100 = 10 x 10^0 = 10 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CDR
Package:     12.5mm

CDEP104NP-1R5MC

Series:      CDEP (Shielded SMD Power Inductor)
Size:        104 (10.0mm x 10.0mm x 4.0mm)
Suffix:      NP = Non-magnetic core
Inductance:  1R5 = 1.5 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CDEP
Package:     10x10x4mm

CR21-100JM

Series:      CR (Chip Inductor)
Size:        21 (2.1mm x 1.2mm, ~0805)
Inductance:  100 = 10 uH
Tolerance:   J = +/- 5%
Suffix:      M = (variant)

Full Series: CR
Package:     2.1mm

CLF10040-470MC

Series:      CLF (Low Profile Power Inductor)
Size:        10040 (10.0mm x 10.0mm x 4.0mm)
Inductance:  470 = 47 x 10^0 = 47 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CLF
Package:     10x10x4.0mm

CDC2G2NP-100MC

Series:      CDC (Common Mode Choke)
Size:        2G2 (variant designation)
Suffix:      NP = Non-magnetic core
Inductance:  100 = 10 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CDC
Package:     2G2

---

Handler Implementation Notes

Pattern Matching

// Sumida patterns have series-specific structures:
// CDRH series: CDRH + size code (nDnn format) + optional suffix + hyphen + value
"^CDRH[0-9]+[A-Z]?[0-9]*[A-Z]*-?[0-9R]+[A-Z]*$"

// CDR drum core: CDR + size code (2-3 digits) + optional suffix + hyphen + value
"^CDR[0-9]+[A-Z]*-?[0-9R]+[A-Z]*$"

// CR chip: CR + size (2 digits) + hyphen + value
"^CR[0-9]+[A-Z]*-?[0-9R]+[A-Z]*$"

// Combined pattern for quick Sumida detection:
"^(CDRH|CDR|CDEP|CDEF|CR|RCH|CEP|CDC|CLF)[0-9A-Z]+-?[0-9R]*[A-Z]*$"

Inductance Value Extraction

The handler includes

extractInductanceValue()

method that:

1. Finds the value portion after the hyphen
2. Parses R-notation (4R7 = 4.7uH, R47 = 0.47uH, 10R = 10uH)
3. Parses EIA 3-digit code (100 = 10uH, 101 = 100uH)
4. Returns formatted string (e.g., "4.7uH", "10uH")

Official Replacement Check

Two Sumida parts are considered official replacements if:

1. Same series (e.g., both CDRH)
2. Same inductance value (e.g., both 4.7uH)

Different size codes, tolerances, or termination options are NOT automatic replacements because they affect electrical performance and footprint compatibility.

Utility Methods

The handler provides additional helper methods:

// Check if MPN is a Sumida inductor
boolean isSumidaInductor(String mpn)

// Get human-readable inductor type description
String getInductorTypeDescription(String mpn)
// Returns: "SMD Power Inductor", "Drum Core Inductor", etc.

---

Related Files

• Handler:

  manufacturers/SumidaHandler.java

• Component types:

  ComponentType.INDUCTOR

• Tests: Check for

  SumidaHandlerTest.java

  in handlers package

---

Learnings & Edge Cases

• Hyphen is optional: MPNs may appear as

  CDRH6D28NP-4R7NC

  or

  CDRH6D28NP4R7NC

• R-notation ambiguity:

  10R

  means 10uH (R as terminator), but

  1R0

  also means 1.0uH (R as decimal)
• NP suffix common: Most Sumida inductors use NP (non-magnetic) suffix before the value separator
• CDC series alphanumeric: CDC series uses alphanumeric size codes (e.g., CDC2G2) unlike numeric-only codes in other series
• CDRH vs CDR prefix: CDRH is the SMD variant, CDR is drum core - pattern matching must check CDRH first to avoid false CDR match
• Series check order matters: Due to prefix overlaps (CDRH/CDR, CDEP/CDEF/CDC), check longer prefixes before shorter ones
• Height encoding varies: CDRH uses 2-digit encoding (28=2.8mm), CDEP uses 1-digit (4=4mm), CLF uses 2-digit different format
• getSupportedTypes() uses Set.of(): Handler correctly uses immutable Set.of() pattern (not HashSet)
• No manufacturer-specific type: Unlike some handlers, Sumida only uses base

  INDUCTOR

  type, not

  INDUCTOR_SUMIDA

Common MPN Variants

CDRH6D28NP-4R7NC   - Standard shielded SMD
CDRH6D28NP-4R7MC   - Magnetic terminals
CDRH6D28-4R7NC    - No NP suffix
CDRH6D284R7NC     - No hyphen separator

Size Code Decoding Edge Cases

The size code decoding assumes specific formats:

• CDRH:

  [L]D[HH]

  - Letter D is always delimiter, not "10" like "10D43"
• CDR: Pure numeric diameter
• CDEP:

  [WW][H]

  - First 2 digits are width, last is height
• CLF:

  [LL][WW][H]

  - Format may vary for different sizes

When decoding produces unexpected results, verify against datasheet.

<!-- Add new learnings above this line -->